The Royal City plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.
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Royal City’s center stands about 1,010 ft above sea level. Within three miles the land runs from 690 ft to 1,190 ft, a difference of 500 ft: hilly country. The highest named summit within 15 miles is Wahatis Peak, about 2,650 ft, 7 miles south-southeast.
Under the town center the state geologic map shows Quaternary nonmarine deposits (sandstone, clay, volcanic), from the Pleistocene, less than 2.6 million years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 9×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Fine-detrital, coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 9 mi of the line.
Basalt. Age: Late Oligocene to Early Pliocene, 3.6 to 28 million years old. About 5 mi of the line.
Sandstone, clay, volcanic. Age: Pleistocene, less than 2.6 million years old. About 5 mi of the line.
Silt. Age: Pleistocene, less than 2.6 million years old. About 2 mi of the line.
Basalt. Age: Early Eocene to Pliocene, 2.6 to 56 million years old. About 2 mi of the line.
Conglomerate, volcanic. Age: Middle Miocene to Pliocene, 2.6 to 16 million years old. About 0.6 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit along the line are not listed.
Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR; rock from the USGS State Geologic Map Compilation.
A raindrop that lands in Royal City reaches the Pacific Ocean by way of Lower Crab Creek and the Columbia: about 430 river miles.
Lake on the way: Lake Umatilla.
210 miles of the trip are on the Columbia.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Royal City; river miles along the main stem, rounded.
